Lead-copper composition.



UNITED STATES IJATNT OFFICE.

EDWARD D. GLEASON, OF NEW YORK, N. Y., ASSIGNOR TO PLASTIC METAL COMPANY,

OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

LEAD-COPPER COMPOSITION.

No Drawing.

Specification of Letters Patent.

Patented Nov. 4, 1913.

T 0 all whom, it may concern.

Be it known that I, EDWARD D. GLEAsoN, a citizen of the United States, residing in Brooklyn, in the county of Kings, city and State of New York, have invented a certain new and useful Improvement in Lead-Copper Compositions, whereof the following is a specification.

My invention relates to plastic compositions including lead and copper, and leadcopper and tin, which may be advantageously used in the manufacture of bearings for shafts, etc.

It is an object of my invention to provide such compositions free from lead sweats and segregation, which are defects usually found in such compositions due to lack of aflinity of the lead for the copper or copper and tin, and the high specific gravity and low melting point of lead, for, at best, such compositions are but mechanical mixtures wherein copper is held in a finely divided state in a matrix of lead.

Another object of my invention is to provide such compositions including a given percentage of copper but of different degrees of hardness.

The efiect of my improvement is to provide a composition which is homogeneous in that the copper therein is comminuted to the greatest possible extent and equally distributed throughout the mass of the composition. I have discovered that the effect aforesaid is attained by adding to the molten copper, in the process of making such a nonmetallic derivative capable of increasing the miscibility of lead and copper, to wit, lead sulfid, and particularly the native lead sulfid, galena. I find it convenient to employ compositions containing lead, lead sulfid, and to 60 per cent. copper. For instance, I fuse 50 pounds of copper and add thereto 5 pounds of galena and then gradually add, to said mixture, 45 pounds of lead. The fused mixture is then poured into pig, ingot or other suitable molds, and, when congealed, fracture thereof shows that the cast metal is homogeneous.

' Harder compositions may be formed by taking 50 pounds of copper, 10 pounds of galena and 40 pounds of lead or 45 pounds of copper, 10 pounds of galena and 45 pounds of lead; said ingredients being mixed as in the first instance above described.

As above indicated, the use of galena is effective for the purpose described when used in compositions containing tin. For instance, I take 60 parts copper, 30 parts lead, 5 parts galena and 5 parts tin, or, parts copper, 35 parts lead, 5 parts galena' and 5 parts tin. However, such compositions including tin form the subject matter of my application Serial No. 7 52,600, filed March 7, y

1913, for Letters Patent of the United States. Moreover, the process herein contemplated, including the, step in the process of alloying copper with another metal which obvious that various modifications may be' made therein without departing from my invention as defined in the appended claims.

I claim 1. A composition containing lead, copper, and lead sulfid.

2. A composition containing lead, lead sulfid, and 50 to 60 per cent. copper.

3. A composition containing lead, a nonmet'allic derivative of lead capable of increasing the miscibility of lead and copper, and copper.

In testimony whereof, I have hereunto signed my name at Philadelphia, Pennsylvania, this sixth day of March, 1913.

' EDWARD D. GLEASON.

Witnesses:

' ARTHUR E. PAIGE,

JOHN DOSCHER.

It is hereby certified that in Letters Patent No. 1,077,699, granted November 4,

1913, upon the application of Edward D. Gleason, of New York, N. Y., for an improvement in Lead-Copper Compositions, an error appears in the printed specification requiring correction as follows: Line after the Word such insert the word compositions; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice. V

Signed and sealed this 18th day of November, A. D., 1913.

i R. T. FRAZIER,

Acting Commissioner of Patents.

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